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- From: koning@koning.enet.dec.com (Paul Koning)
- Newsgroups: rec.skydiving
- Subject: Re: student radios
- Message-ID: <1992Nov17.161705.20814@engage.pko.dec.com>
- Date: 17 Nov 92 16:17:05 GMT
- References: <1992Nov17.125417.18137@cc.tut.fi>
- Sender: newsdaemon@engage.pko.dec.com (USENET News Daemon)
- Reply-To: koning@koning.enet.dec.com
- Organization: Digital Equipment Co., distributed systems architecture
- Lines: 44
-
-
- In article <1992Nov17.125417.18137@cc.tut.fi>, jatu@ee.tut.fi (Tuukkanen Janne) writes:
- |> We have had some problems with our student radios. Looks like those damn
- |>radios just play top 20 when the ground radio man screams reserve commands
- |>to the student :-) Our receivers are placed in a little pocket on the left arm
- |>of students suits. Maybe that wire from radio to the little speaker inside
- |>the helmet causes the problem? Or our ground radio has not enough watts (1W)?
- |>We have searched for better receivers, but there is not such simple
- |>radios available (nice Japanese scanner receiver costs about $700 each,
- |>but we need only one channel...).
- |> Your experiences with student radios? Helmet assembly would maybe help,
- |>but what is the best place? Has anyone heard canopy entanglements to a
- |>student radio?
- |>--
- |> Janne Tuukkanen
- |> VW-Beetle, parachute and mirrorshades, all I need! jatu@cc.tut.fi
-
- What frequency do these radios use? If you have trouble with interference,
- you may have a frequency too close to that of a nearby broadcast station.
- (Or it may be too close to a small multiple of a broadcast frequency, that
- can cause problems too.)
-
- A single frequency receiver is quite simple, and there's no reason why it
- should be expensive. But they may not be particularly common, so you may
- have to choose between cheap (and garbage) or good (and expensive simply
- because not many are sold).
-
- One possible problem: are you using a frequency that's shared with lots of
- other activities? If so, you may have to put up with that interference,
- unless you can get a different frequency. I've seen student radios around
- here that used CB frequencies, but that became too unreliable and they
- were switched to a business private radio frequency. Those are still shared
- with others, but it does reduce the problem somewhat.
-
- 1 Watt should be MORE than enough for this application.
-
- Unless you insist on factory made equipment, one solution might be to find
- an amateur radio group nearby and ask them for help. They should understand
- the problems and be able to give good advice on your specific situation, and
- they might be interested in building appropriate receivers specifically for
- your application. (Such receivers would probably be both cheaper and higher
- quality than factory stuff..)
-
- paul, A-13683, NI1D
-